how'd the length get up to 280mm ? i thought it was 250mm ?
11 + inches kinda kills it for reasonably priced heat sinks .
cheers Woody
Woody,
You will really, really need large heatsinks for this.
The size was based around the 300mm heatsinks that are commonly used.
Bear in mind you have 8 MOSFETS in class A so they are dissipating alot of heat.
Where did you get the idea about 250mm?
Andy
Yes, 4 amp boards for F5TURBOX and 4 or 6 psu boards.
The wonderful psu boards I can also use for other projects.
One possible cost effective heatsink option I was thinking of
is something like 10 wide X any length quoted ones from likes of heatsinkusa.com.
Since it is better the pins run vertical rather than horizontal, I'm considering getting 4 pieces of 10 inch wide 12inch high and bolt 2 together for each left and right side. That would make 20inch long 12 inch high per each side of stereo. Eventually I will build another one and turn them in monoblocks with higher bias current or balanced version.
-John
is something like 10 wide X any length quoted ones from likes of heatsinkusa.com.
Since it is better the pins run vertical rather than horizontal, I'm considering getting 4 pieces of 10 inch wide 12inch high and bolt 2 together for each left and right side. That would make 20inch long 12 inch high per each side of stereo. Eventually I will build another one and turn them in monoblocks with higher bias current or balanced version.
-John
Similar idea ..... going for 12 in height not sure how much class-a bias as yet , 50 watt / ch sounds about where i wanna be !!!
http://www.heatsinkusa.com/products/8.460"-Wide-x-12"-Long-Heatsink.html
4 of these per amp .... yes fan too ...
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hehehe😀 a lot more fun😀
i use aleph2 monoblocks in wintertime🙂 and are now building F5 for summer time🙂 and a aleph30🙂
I'd guess you'd need around 1 kva per channel of transformer and two power supply boards. Sounds like a massive project inside one chassis.
None of my business, but with a 0.30" base plate and 1" fins, that heatsink doesn't deliver beyond a height of 7 inches.
(y'all know it's girth that matters)
The HeatsinkUSA E007 has 2.5 inch fin height, 3/8 inch baseplate.
But I agree that increasing the length (parallel direction of fins) of the heatsink doesn't help much beyond a certain point.
Well it's 16 inchs of girth and 12 inch looks good and fit a lot of caps and transformers ......... 🙂
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Here is a simulation using the HeatsinkUSA E007 - 20" wide x 12" long, 48 fins, 180 W dissipation. With natural convection, the C/W is still too high.
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I agree, unless you use a fan.
Here is a simulation using a single HeatsinkUSA E007 12 inches long with an air velocity of .679 m/s. The table show results with other air velocities.
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